using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using JGSY.CMS.LowCode.Platform.Application.DTOs;
using JGSY.CMS.LowCode.Platform.Application.Interfaces;

namespace JGSY.CMS.LowCode.Platform.Application.Services
{
    /// <summary>
    /// 发布管理应用服务实现
    /// </summary>
    public class PublishingAppService : IPublishingAppService
    {
        private readonly ILogger<PublishingAppService> _logger;
        private static readonly List<PublishHistoryDto> _publishHistory = new();
        private static readonly List<PublishQueueDto> _publishQueue = new();

        public PublishingAppService(ILogger<PublishingAppService> logger)
        {
            _logger = logger;
        }

        /// <summary>
        /// 发布内容
        /// </summary>
        public async Task PublishAsync(long contentId, string? publishTime = null, string? targetEnvironment = null)
        {
            try
            {
                _logger.LogInformation("Publishing content: {ContentId}, PublishTime: {PublishTime}, TargetEnvironment: {TargetEnvironment}", 
                    contentId, publishTime, targetEnvironment);

                // 模拟发布过程
                await Task.Delay(100);

                // 添加到发布历史
                _publishHistory.Add(new PublishHistoryDto
                {
                    Id = _publishHistory.Count + 1,
                    ContentId = contentId,
                    Status = "Published",
                    ActionType = "Publish",
                    Operator = "System",
                    ActionTime = DateTime.UtcNow,
                    TargetEnvironment = targetEnvironment,
                    CreatedAt = DateTime.UtcNow,
                    PublishedAt = DateTime.UtcNow,
                    Version = 1
                });

                _logger.LogInformation("Content published successfully: {ContentId}", contentId);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error publishing content: {ContentId}", contentId);
                throw;
            }
        }

        /// <summary>
        /// 取消发布内容
        /// </summary>
        public async Task UnpublishAsync(long contentId)
        {
            try
            {
                _logger.LogInformation("Unpublishing content: {ContentId}", contentId);

                // 模拟取消发布过程
                await Task.Delay(100);

                // 添加到发布历史
                _publishHistory.Add(new PublishHistoryDto
                {
                    Id = _publishHistory.Count + 1,
                    ContentId = contentId,
                    Status = "Unpublished",
                    ActionType = "Unpublish",
                    Operator = "System",
                    ActionTime = DateTime.UtcNow,
                    CreatedAt = DateTime.UtcNow,
                    Version = 1
                });

                _logger.LogInformation("Content unpublished successfully: {ContentId}", contentId);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error unpublishing content: {ContentId}", contentId);
                throw;
            }
        }

        /// <summary>
        /// 获取发布历史
        /// </summary>
        public async Task<IEnumerable<PublishHistoryDto>> GetPublishHistory(long contentId, int page = 1, int limit = 10)
        {
            try
            {
                await Task.Delay(10);
                
                return _publishHistory
                    .Where(h => h.ContentId == contentId)
                    .OrderByDescending(h => h.ActionTime)
                    .Skip((page - 1) * limit)
                    .Take(limit)
                    .ToList();
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error getting publish history for content: {ContentId}", contentId);
                return new List<PublishHistoryDto>();
            }
        }

        /// <summary>
        /// 获取发布队列
        /// </summary>
        public async Task<IEnumerable<PublishQueueDto>> GetPublishQueueAsync(string? status = null, int page = 1, int limit = 10)
        {
            try
            {
                await Task.Delay(10);
                
                var query = _publishQueue.AsQueryable();
                
                if (!string.IsNullOrEmpty(status))
                {
                    query = query.Where(q => q.Status == status);
                }
                
                return query
                    .OrderByDescending(q => q.CreatedAt)
                    .Skip((page - 1) * limit)
                    .Take(limit)
                    .ToList();
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error getting publish queue with status: {Status}", status);
                return new List<PublishQueueDto>();
            }
        }
    }
}
